Stockbridge Master Fund (OS), L.P.

CIK 1522786 · last filed 2016-03-24

Stockbridge Master Fund (OS), L.P. is a corporate insider who has filed 3 SEC Form 4 insider transactions across 2 companies since 2011. The most recent filing shows the insider bought $181.9M of MFRM on Mar 24, 2016. Across all open-market trades the lifetime net is −$227.8M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $334.7M across reported positions.

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

Disclosed Exposure

$334.73M

Companies

2

Total Filings

3

Lifetime Open-Market Net

-$227.77M

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.

Symbol	Role	Shares	Price	Disclosed Exposure	Lifetime OM Net	Filings	Latest Filed
MATTRESS FIRM HOLDING CORP. (MFRM) Delisted	10%+ Owner	4,293,881	—	—	$181.92M	1	2016-03-24
CRI	10%+ Owner	7,810,804	$42.85	$334.73M	-$409.68M	2	2012-04-30

Recent Filings

3 filings

Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.

Filed	Symbol	Action	Net Shares	Net $	Link
2016-03-24	MATTRESS FIRM HOLDING CORP. (MFRM) Delisted	Buy (P)	+4,671,510	$181.92M	EDGAR
2012-04-30	CRI	Sell (S)	−7,918,120	-$436.98M	EDGAR
2011-06-08	CRI	Buy (P)	+920,700	$27.30M	EDGAR

Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.